Stunt performer and longtime friend Mark Pettograsso has worked on some of the biggest movies, TV shows and commercials of the past 15+ years. As stunt coordinator on "IF" (in theaters now), he collaborated with director John Krasinski and worked closely with star Ryan Reynolds on some of the film's biggest and most challenging sequences. Pettograsso shares behind the scenes stories on "IF" and more in this in-depth interview.